HARNESS AS-LIGHTING 1215905 - Caterpillar

Adjust Knife Arm Blade Open Pressure
Illustration 2 g06186110
Knife arm blade open cartridge
Knife arm blade close cartridge
Accumulator purge valve
Pressure gauge portNote: This procedure requires 2 people.Note: Locate the pressure gauge port (4) on the manifold block. Remove the plug from the pressure gauge port and install a pressure gauge with a rating of 0–20685 kPa (0–3000 psi).
start the carrier engine
Open the knife arm blades, keeping the knife arm button depressed.
Illustration 3 g06186116
Turn the adjustment screw (5) clockwise to decrease the knife arm blade open pressure.
Turn the adjustment screw counterclockwise to increase the knife arm blade open pressure.
Knife arm blade open pressure should be adjusted to 11722 kPa (1700 psi).Note: Do not set pressure outside the pressure range.
Tighten the jam nut on the knife arm blade open cartridge valve.
Release the knife arm blade open button.Adjust Knife Arm Blade Close Pressure
Illustration 4 g06186110
Knife arm blade open cartridge
Knife arm blade close cartridge
Accumulator purge valve
Pressure gauge portTo perform these steps, locate the pressure gauge port (4) on the manifold block. Discharge the accumulator. Clean area around the plug, remove the pressure gauge port plug. Install a pressure gauge with the rating of 0–20685 kPa (0–3000 psi).
Start the engine of the carrier machine.
Illustration 5 g06186357
Loosen the jam nut (5) on the knife arm blade close cartridge valve.
Open the delimber knife arms until the accumulator is fully charged.
Close the delimber knife arm blades.
Adjust the delimber knife arm pressure to 4134 kPa (600 psi).
The pressure reading will slowly fall and stop at the setting of the knife close cartridge valve.
Turn the adjustment screw counter-clockwise to decrease the knife arm blade close pressure. Repeat steps 3–6.
Turn the adjustment screw clockwise to increase the knife arm blade close pressure. Repeat steps 3–6.
Knife arm blade pressure should be adjusted to 4134 kPa (600 psi).Note: Do not adjust pressure outside of the pressure range.
Tighten jam nut on knife arm blade close cartridge valve.Saw Bar Up Pressure AdjustmentNote:
Adjusting saw bar up pressure too high will cause the saw bar to slam into the saw box.The saw bar up pressure is controlled by the pressure reducing valve located in the pressure reducing valve block.
Illustration 6 g06186811Note: Clean the area around the gauge port in pressure reducing valve block.
Install a 0–20685 kPa (0–3000 psi) pressure gauge in the gauge port of the pressure reducing block.
Start the power source.
Verify that the pressure adjustment screw on the bar down pressure cartridge valve is fully backed out.
Activate the valve to raise the saw bar.
Adjust the saw bar up pressure cartridge valve to 5512 kPa (1800psi).
Tighten jam nut in saw bar up pressure cartridge valve.Note: Verify that all set screws on flow control valves and jam nuts on cartridge valves are tightened.Note: Adjusting the saw bar up pressure too low will cause the delimber knives to drift shut.Saw Bar Down Pressure AdjustmentNote:
Adjusting saw bar down pressure too high will cause excessive bar wear.The saw bar down pressure is controlled by the pressure reducing valve located in the pressure reducing valve block.
Illustration 7 g06186498
Saw Bar Down Pressure CartridgeNote: The bar down pressure can be